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(A) Pelvic lateral radiograph in supine position, SS is 28°, acetabular anteversion is 5°. (B) Pelvic lateral radiograph in standing position, SS is 14°, acetabular anteversion is 19°. (C) Pelvic lateral radiograph in sitting position, SS is −10°, acetabular anteversion is 44°. (D) Dislocation of the hip occurs when the patient flexes the hip joint excessively in the sitting position.
